class Bean
  def initialize(cool)
    @cool = cool
  end

  def is_cool
    return @cool
  end

  def be_cool=(cool)
    @cool = cool
  end
end

def we_cool(beans)
  for bean in beans
    if not bean.is_cool()
      puts "Not cool."
      bean.be_cool = true
    end
  end
  puts "We cool."
end

beans = [Bean.new(true), Bean.new(false)]
we_cool beans